1. Querying XML
XSLT

2. XSLT Querying XML Not nearly as mature as Querying Relational
Newer
No underlying algebra
Sequence of development
1. XPath
2. XSLT
3. XQuery

3. XSLT XSLT XSL = Extensible Stylesheet Language
XSLT = XSL (with) Transformations

4. XSLT XSLT as Query Language XSLT Processor Query Processor XSLT
Specification
(in XML)
XML
Document
or Stream
XML
Document
or Stream
XSLT
Processor
Query
Database
Query
Processor
Answer

5. XSLT XSLT: Rule-Based Transformations Demo: XSLT examples
Match template and replace
Recursively match templates
Extract values
Iteration (for-each)
Conditionals (if)
Strange default/whitespace
behavior
Implicit template priority
scheme
Demo: XSLT examples
over bookstore data